// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

#include <aries/parquet/level_comparison.h>

#define PARQUET_IMPL_NAMESPACE standard
#include "aries/parquet/level_comparison_inc.h"
#undef PARQUET_IMPL_NAMESPACE

#include <vector>

#include <nebula/bits/dispatch.h>

namespace parquet::internal {
#if defined(ARROW_HAVE_RUNTIME_AVX2)
    MinMax FindMinMaxAvx2(const int16_t *levels, int64_t num_levels);
    uint64_t GreaterThanBitmapAvx2(const int16_t *levels, int64_t num_levels, int16_t rhs);
#endif

    namespace {
        using ::nebula::internal::DispatchLevel;
        using ::nebula::internal::DynamicDispatch;

        // defined in level_comparison_avx2.cc

        struct GreaterThanDynamicFunction {
            using FunctionType = decltype(&GreaterThanBitmap);

            static std::vector<std::pair<DispatchLevel, FunctionType> > implementations() {
                return {
                    {DispatchLevel::NONE, standard::GreaterThanBitmapImpl}
#if defined(ARROW_HAVE_RUNTIME_AVX2)
            ,
                    {
                        DispatchLevel::AVX2, GreaterThanBitmapAvx2
                    }
#endif
                };
            }
        };

        struct MinMaxDynamicFunction {
            using FunctionType = decltype(&FindMinMax);

            static std::vector<std::pair<DispatchLevel, FunctionType> > implementations() {
                return {
                    {DispatchLevel::NONE, standard::FindMinMaxImpl}
#if defined(ARROW_HAVE_RUNTIME_AVX2)
            ,
                    {
                        DispatchLevel::AVX2, FindMinMaxAvx2
                    }
#endif
                };
            }
        };
    } // namespace

    uint64_t GreaterThanBitmap(const int16_t *levels, int64_t num_levels, int16_t rhs) {
        static DynamicDispatch<GreaterThanDynamicFunction> dispatch;
        return dispatch.func(levels, num_levels, rhs);
    }

    MinMax FindMinMax(const int16_t *levels, int64_t num_levels) {
        static DynamicDispatch<MinMaxDynamicFunction> dispatch;
        return dispatch.func(levels, num_levels);
    }
} // namespace parquet::internal
